One thing I'd like to add - the winter and summer courts both have seelie and unseelie in their number.

There are three courts - the seelie, the unseelie, and the court of heroes and fools, usually referred to as the shadow court.

There are seven courts, technically, but all the seasonal courts are also ruled by the three main courts. The court of fools exists to balance the seelie and unseelie, and make sure there is always someone to clean up messes and make sure everything continues to flow as it should. Faeries are very... static. The court of heroes is NOT. They break things that need breaking, and change things that do not change.

"She’s all the unsung heroes who... never quit." ― R. A. Heinlein, Stranger in a Strange Land“There are more things in Heaven and Earth, Horatio, than are dreamt of in your philosophy.” ― William Shakespeare, Hamlet“Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.”― H.L. Mencken, Prejudices: First Series